Question

1.Consider an application which transmits data at a bursty rate (e.g., the sender generates data for short burst of time and the sender is idle almost all the time)
Would a packet-switched network or a circuit-switched network be more appropriate for this application?Why?

2.DNS can not work if the host names are not hierarchal? Explain?

3.FTP is a push protocol?

True

False

4.Is it is possible for an application on top UDP to have a reliable data transfer? explain?

5. SMTP is an inherently secure protocol

True

False

6.POP3 runs on top UDP?

True

False

7.UDP is a not reliable transfer protocol.

True

False

8.What are the the layers that run in the network core?

9.Would the DNS protocol work if IP addresses are not hierarchical? Explain why?

10. in P2P, each peer only upload chunks to a limited number of peers? Why is the Bit torrent designed in such a way?

Answer 1

Answer 3:- False, FTP is not a push protocol. FTP is a standard network protocol used for the transfer of computer files between a client and server on a computer network.

Answer 4:- UDP as a protocol is not meant to be relible. It was designed to write applications which need speed not reliablity. But you can add reliablility at your application layer. Application can send message to lower UDP layer if any packet has not been received and other end need to retransmit.

Answer 5:- False, SMTP is an inherently secure protocol.

Answer 6:- False, POP3 runs on TCP rather than UDP because TCP provides the reliable dta transfer from one host to another host. On other hand UDP dosen't.

Answer 7:- True, UDP does not procvide error correction and is therefore an unreliable protocol.

Answer 8:- The layer that run in network core are:-

• Aggregation
• Authentication
• Call Contol/ Switching
• Charging
• Service Invocation
• Gateways

Answer